Re: Help me use my brain.
 

GSU

Re: Help me use my brain.
 

Chess or Go.
Origami.
an internal-style martial art(high concentration levels)
Study history
Take up cooking -- not brainy, but stimulating and fun, and not all that easy to do really well. Plus the family will love the results if you get good, and with your kids you'll always have unbiased, finicky guinea pigs.
Take so many drugs you're brain-damaged and don't have excess mental capacity anymore. When it takes a major effort just to remember where you are, you won't have to worry about having an idle mind anymore.
Learn HTML and start-up a website on something. Write an e-book and sell it on your website.

Re: Help me use my brain.
 

OOT is the opposite of intellectual stimulation, so stay away.

Pick up chess or bridge.

Re: Help me use my brain.
 

Have you considered teaching? With an MBA you can teach classes at a junior college, and you'd get much of the stimuli you mentioned in your post. You could start out slow, see if you could make some connections wherever you got your MBA and possibly assist with certain courses etc. You might need to take some classes in teaching, but it doesn't sound like that's a problem.

If you do end up liking it you could always work on getting a phd and teach at a four year college.

Swede

Re: Help me use my brain.
 

Extra-maritial affair.

Re: Help me use my brain.
 

CIA operative

Re: Help me use my brain.
 

WoW

Re: Help me use my brain.
 

golf

Re: Help me use my brain.
 

make some art

Re: Help me use my brain.
 

Build a ship in a bottle.